Browsers cache images too long

[nopara73]

If image is updated the browser doesn't show that

[nopara73]

If I add the version stuff the cache will reset:

<script src="/js/pheno-age.js?v=1.1"></script>

But maybe I could reset cache every week:

<script>
    var date = new Date();
    var year = date.getFullYear();
    var week = Math.ceil(((date - new Date(year, 0, 1)) / 86400000 + new Date(year, 0, 1).getDay() + 1) / 7);
    var script = document.createElement('script');
    script.src = '/js/pheno-age.js?v=' + year + '-' + week;
    document.head.appendChild(script);
</script>